I think you would get more money if you sell parts separately. For your CPU+mobo+ram, I think you could get 300 for it without issues, maybe 100-120 for the video card, PSU 80-100 I think, THe fans and stuff just keep them for another build. I wouldnt sell the psu either, as its a quality psu, and in your next build you would spend 200 to get a quality psu maybe from Corsair.